My stm32l4 discovery kit iot node b-l475e-iot01 stopped the connection via connector 8, I couldn't do it at all, so I used ST-LINK V2, I got communication, but I can't use the USB again, I didn't touch the hardware, absolutely nothing.
Not sure what the expectations are here. You'll have to figure out what's broken and perhaps user a debugger.
The micro-USB connectors are not hard to damage. Micro-USB cables some times only have power connections (charger cables)
The STM32L4 side of the USB will be dependent on functional USB Device firmware running on the processor. With BOOT0 HIGH this might present as an "STM32 BOOT" device.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.